Step up and join the Denver community to conquer cancer. This weekend, challenge yourself with the task of climbing 1,765 stairs at Dick's Sporting Goods Park. Ease the pain of your burning thighs and knees with live music along the way, and yoga and massage stations after the trek. Take your pick from more than 40 nonprofit organizations providing information on prevention, treatment, and advocacy of cancer. If you're not much of a stair stepper, opt for the stairless course around the field. Sun 6:30 a.m.